Q- Give one example of:- positive work done negative work done zero work done
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1. Positive work done- Dropping a ball, pushing a book, rolling a ball, pulling a chair
2. Negative work done- Throwing a ball, Applying breaks, Work done by frictional force when we push a table,
Work done by buoyant force when an iron nail is sinking
3. Zero work done- When we pusha rigid wall, angle between force and displacement is 90
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